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Found out this exists just now: https://www.aliexpress.com/item/-/32860536002.html
£17 for 8-speed 11-40 - get a £3 road-link off there as well, pair up with a long-cage 9-speed Shimano MTB mech (Deore or something - <£10 if you hunt about?) and 8-speed brifters (I've got some horrible Microshift ones you can have really cheap), find some cranks and a chainring and you've got ultra-budget wide-range 1× for under £50
Unsure, given it’s budgetness I’d assume screw-on. Tbh if a cheap lighter wheelset appears I could be tempted if going to 8sp opens up my options.
First step is ditching the chainset I think.